title: Slice with angulated non-parallel boundaries.
abstract: Adiabatic pulses are widely used for spatial localization in magnetic resonance spectroscopy because of their high immunity to RF inhomogeneity and excellent slice profiles. Since non-rectangular volume is often preferred in localized spectroscopy, we propose a scheme for selecting a trapezoidal slice using adiabatic π pulses. In this scheme, a time-varying gradient orthogonal to a stationary slice selection gradient is used to change the boundaries of the slice profile from parallel to non-parallel. Numerical simulation results for the transverse and longitudinal magnetization using different RF and gradient waveforms are presented for non-parallel slice selection. Phantom imaging and in vivo(1)H MRS of rat brain using non-parallel slices are demonstrated.
authors.affiliation: Molecular Imaging Branch, National Institute of Mental Health, Intramural Research Program, NIH, Bethesda, MD, USA. parkb3@mail.nih.gov
authors.forename: Busik
authors.initials: B
authors.lastname: Park
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Lizak
authors.forename: Yun
authors.initials: Y
authors.lastname: Xiang
authors.forename: Jun
authors.initials: J
authors.lastname: Shen
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D001931:Brain Mapping / Q000379:methods*; D003198:Computer Simulation; D007089:Image Enhancement / Q000379:methods; D009682:Magnetic Resonance Spectroscopy / Q000295:instrumentation / Q000379:methods*; D019047:Phantoms, Imaging; D011846:Radio Waves; D051381:Rats